Sheet Conveying Device Pad Assembly Vibration Damping
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Solution Overview
Problem
Existing sheet conveying devices with separator pads generate undesirable noise due to self-excited vibrations, which are difficult to completely eliminate with weights alone.
Innovation Solution
A sheet conveying device design that includes a separator roller, a pad assembly with a swingable holder, a spring to urge the pad assembly toward the separator roller, and a slidable film that dampens vibrations by sliding against base and holder sections, reducing frictional noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a weight is provided to the holder to reduce self-excited vibration, then noise is reduced to some extent, but the noise cannot be completely eliminated and the device complexity increases
Solution Approach 1:
A damper is introduced as an intermediary component between the holder and the base member to absorb self-excited vibrations. The damper contains a viscous fluid that provides damping force to suppress vibrations without requiring additional weights or complex mechanisms, thus effectively reducing noise while maintaining device simplicity.
Solution Approach 2:
The damping characteristics are changed by using a viscous fluid with specific viscosity properties in the damper. By adjusting the fluid viscosity and damper geometry, the damping force is optimized to effectively suppress self-excited vibrations across different operating conditions, achieving complete noise elimination without increasing device complexity.
2Object-affected harmful factors
If the holder is made swingable to reduce frictional noise, then noise is reduced, but the reliability may be compromised due to potential instability
Solution Approach 1:
The damper serves as a mediator that provides controlled resistance to the swingable holder's motion. This damping force suppresses self-excited vibrations and stabilizes the holder during operation, preventing excessive swinging while maintaining the frictionless contact benefit, thus improving reliability without eliminating the swingable design.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Effectively reduces noise caused by self-excited vibrations in the pad assembly, preventing sheet jams and maintaining efficient sheet conveyance.
Implementation Method 1
a spring, which urges the pad assembly toward the separator roller
Implementation Method 2
a slidable member, which is attached to the pad assembly to be integrally movable with the pad assembly and to be slidably in contact with a first slidable section in the base member
Data Source
AI summary
A sheet conveying device to convey a sheet in a sheet path is provided. The sheet conveying device includes a separator roller, which is arranged to be rotatably in contact with the sheet to apply conveying force to the sheet, a pad assembly including a separator pad, which is arranged to be in contact with the sheet stack to apply convey resistance to the sheet stack, and a holder, which is swingably attached to a base member and holds the separator pad, the base member being in a fixed position with respect to the separator roller, a spring, which urges the pad assembly toward the separator roller, and a slidable member, which is attached to the pad assembly to be integrally movable with the pad assembly and to be slidably in contact with a first slidable section in the base member.